<template>
    <div class="login_container">
        <!-- 登录框区域 -->
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/Q版刻晴.jpg" alt="">
            </div>
            <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" label-width="0px" class="login_form" :rules="loginFormRules">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input
                    v-model="loginForm.username"
                    prefix-icon="iconfont icon-user">
                    </el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input
                    v-model="loginForm.password"
                    prefix-icon="iconfont icon-3702mima"
                    show-password
                    clearable>
                    </el-input>
                </el-form-item>
                <el-form-item class="buttons_style">
                    <el-button type="primary" class="but1" @click="login">登录</el-button>
                    <el-button type="info" class="but2" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
    // 登录表单的数据绑定
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单的验证规则
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置用户名与密码为初始值
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        } else {
          this.$message.success(res.meta.msg)
        }
        // 1. 将登录成功之后的 token，保存到客户端的 sessionStorage 中
        //   1.1 项目中出了登录之外的其他API接口，必须在登录之后才能访问
        //   1.2 token 只应在当前网站打开期间生效，所以将 token 保存在 sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)
        // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container{
    background-image: url(../assets/甘雨和刻晴.jpg);
    background-repeat: no-repeat;
    background-size: 100%;
    height: 100%;
}
.login_box{
    width: 500px;
    height: 330px;
    border-radius: 10px;
    background-color: white;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}
.avatar_box{
    height: 140px;
    width: 140px;
    border: 1px solid #eee;
    border-radius: 50%;
    box-shadow: 0 0 10px;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    img{
        height: 100%;
        width: 100%;
        border-radius: 50%;
    }
}
.login_form{
    position: absolute;
    bottom: 20%;
    width: 100%;
    padding: 0 45px;
    box-sizing: border-box;
}
.buttons_style{
    width: 100%;
    // position: absolute;
    // left: 50%;
    // transform: translate(-50%);
}
.but1{
    position: absolute;
    left: 31%;
}
.but2{
    position: absolute;
    right: 31%;
}
</style>
